Sigmund bergmans



(No Model.)

S. BERGMANN.

SOCKET FOR INGANDESGENT ELECTRIC LAMPS.

No. 311,100. Patented Jan. 20, 18 85.

N. PETERS. Pholwmm n mr. Washington. Dv c.

UNITE STATES SIGMUND BERG-MANN, OF

ATE-NT HQE.

NEW YORK, N. Y., ASSIGNOR TO BERGMANN & (30., OF SAME PLACE.

SOCKET FOR INCANDESCENT E'LECTRlC LAM PS.

SPECIFICATION forming part of Letters Patent No. 311,100, dated January 20, 1885.

Application filed April 10, 189.4. (No model.)

To all whom it may concern.-

Be it-known that I, SIGMUND BERGMANN, of New York, in the county and State of New York, have invented certain new and useful Improvements in Sockets for Electric Lamps, of which the following is a specification.

My invention relates to sockets for use with those incandescing electric lamps whose terminals are a screw-threaded ring and a plate on the base of thelan1p,thelamp being screwed into the socket and making contact with corresponding terminals within the same; and my object is to provide a socket of this kind which shall be compact and of as few parts as possible; in which the amount of insulating material used shall be very small. and which shall contain a simple and effective form of circuit-controller. The manner in which I accomplish this object is shown in the accompahying drawings, in which Figure 1 is an elevation of the socket complete; Fig. 2, a vertical section of the same; Fig. 3, a bottom view of the insulating-disk, which carries the terminals and circuit-controller; Fig. 4, a top view of the socket, with its exterior metal casing removed; Fig. 5, an elevation of the socket, with the outer casing and contact-sleeve removed, and viewed from the side opposite the key; and Fig. 6, an elevation of the base of the lamp.

Like letters refer to corresponding parts in all these figures.

A is a disk of insulating material. I prefer to use a non-combustible and non-carbonizable material, such as lava. This is desirable in a socket of this character, because the contacts and terminals are placed close together in a small space, so that there may sometimes be danger of a short-circuit between them, and also circuit is continually being made and broken by the socket-key, in some cases causing considerable spark. I would here state that I am aware of United States Patent to Sawyer and Man, N 0. 229,47 6. Thedisk has a central aperture, a, and raised walls I) b on each side of said aperture.

Upon the top of the disk A is placed an externally and internally screw-threaded metal sleeve, B, having an inward flange, c, at its lower end, through which screws (2 cl pass, securing the sleeve to the insulating-disk.

The flange c encircles the central elevation, 12 b, of the disk. The ring or band terminal B of the lamp is screwed into the sleeve B, whereby connection is made between these two parts, and the plate or tip terminal of the lamp rests upon the raised part b b of the insulating-disk. The disk A is supported from below by means of the lat metal ring 0, from which a part, D, extends up, having horizontal projections c c, to which disk A is screwed. The sleeve f for the circuit-controlling key extends inwardly i'rom the part D. The ring or plate 0, upwardly-extending part D, and sleevef are preferably all made in one piece. On the lower side of disk A is also secured by screws the plate which has a downwardly-extending part, 71, carrying a binding-screw, 7a, to which one of the circuitwires is to be attached. The screw (1, passing through flange c and disk A, enters the plate 9, thus connecting the circuit-wire with the sleeve B, as well as assisting in securing the sleeve to the disk.

. E is a metal piece, secured by screws to the under side of disk A.' Arm Z extends from it, being turned at right angles for compactness, and carries binding-screw 7c, which is the other circuit-wire terminal. All the screws a which secure the metal parts below the disk to it have their heads embedded in the disk and covered with an insulating cement or other material, so that they cannot come in contact with sleeve 13. For this reason they are not visible in Fig. The two bent springs in m are attached by rivets to the piece E. One of these, m, passes through the central aperture in the disk A, and has its end an bent horizontally, passing through slot or openingn in the lower portion of sleeve 13, and resting, when the circuit is open, upon the upper side of disk A. Spring m is a reenforcing spring to assist the action of the spring m. Through the sleeve f passes the circuiteontrolling key, which is a metal rod, 0, having a thumb-piece, F, outside the socket, and an insulating-tip, p, which presses against the spring m. The insulating-tip removes the key from the circuit. Thekey has apin, T, which passes through the oblique slot sin sleeve f, so that when the key is turned it presses against spring on and throws its bent end m up against the plate terminal. m" of the lamp,

which, when the lamp is screwed in, rests upon the central elevation, b b, which prevents the terminal from touching the flange c. The connection formed when the circuit is closed is a reliable spring-contact, and one which allows the lamp to be turned in the socket without breaking connections. To close circuit, the key is turned until pin r rests in notch t, and to open circuit, the key is turned back from said notch, when m m spring back,

--bringing m down upon the disk A again.

The socket is completely inclosed by a metal casing. The ring 'or plate is covered by cap G, which is held by flat-headed screws u u, inserted in ring O,whose heads pass through oblong apertures in the cap and are then turned across the apertures. From the lower side of the cap extends an internally-screw-threaded sleeve or tube, 11, soldered to or made in one piece with the cap. This is screwed upon the fixture through which the circuit-wires run, extending through sleeve H into the interior of the socket, where, as before stated, they are held by binding-screws k 7.1. A set-screw, '0, passes through the side of sleeve II and is set against the fixture, to prevent the turning thereon of the socket and consequent twisting of the wires. A. metal shell, I, is placed over the upper part of the socket setting in the cap G, and having a slot for the circuit-controlling key. The portion of the slot below the key is filled by a plate, y, secured to part D by rivets or screws 2. Finally, a flanged ring, K, of hard rubber or other suitable insulating material, is screwed in between sleeve B and shell I, serving to keep these parts separate and to hold the shell in place.

The socket, constructed as described, is of a neat appearance, is very compact, has no useless mass of insulating material, being merely a metal skeleton with just enough insulation to separate the terminals, all the circuit-connections being carried by the single insulating-disk instead of bein g divided among two or more insulating portions,as heretofore. The circuit-controller making and breaking circuit upon the lamp-tip employs fewer parts and is simpler in construction than any heretofore used, while it is very clfieient in operation, and the whole may be put together or taken apart with great readiness, the parts being easily separable.

What I claim is 1 In a socket for an electriclamp, the combination of two circuit terminals, one a sleeve adapted to make contact with the band or ring terminal, the other a spring movable into and out of contact with the bottom terminal of the lamp, substantially as set forth.

2. In a socket for an electric lamp, the combination of a disk of insulating material, a contact-slccvc carried by said disk,for making contact with the band or ring terminal of the lamp, and a contact-piece,also carried by said disk,for making contact with the bottom terminal of the lamp, substantially as set forth.

In a socket for an electric lamp, the combination, with a disk of insulating material, of a contact-sleeve for making contact with the band or ring terminal of the lamp, a contact-piece for making contact with the bottom terminal of the lamp, and two terminals for the circuit-wires leading to the socket, all said socket contacts and terminals being carried by the saidinsulating-disk, substantially as set forth.

4. In a socket for an electric lamp having two terminals for making connection with corresponding lamp terminals, the combination of a metal supporting portion and a disk of insulating material carried thereby and carrying all the terminals and contacts of the socket, substantially as set forth.

5. In a socket for incandescing electric lamps having a bottom terminal movable into and out of contact with the plate terminal of the lamp, the insulating-disk having a raised portion meeting said plate terminal, substantially as set forth.

6. The combination of the insulating-disk having an aperture in its center, and the contact-spring working through such aperture, for making and breaking circuit with a lamp terminal, substantially as set forth.

7. The combination, with the insulatingdisk having a central aperture, of a contactspring sccu red bencaih said disk, passing through the aperture, and bent horizontally above the disk, substantially as set forth.

8. The combination of the sleeve 13 and the movable contact-spring m", said sleeve having a slot to allow the movement of said spring, substantially as set forth.

9. The combination, with a contact-spring, substantially of the form described, of a sepa rate turning-key bearing against said spring, whereby it may be forced upward to make contact, substantially as set forth.

10. The combination of the sleeve B, the insulatingdisk, and a circuit-wire terminal beneath said disk, with the connecting-screw extending through the disk from said sleeve to said terminal, substantially as set forth.

11. The c01nbination,.'with the insulatingdisk and metal parts attached thereto, of the attaching-screws having their heads covered with insulating material, substantially as set forth.

12. The combination of the circuit-closing spring and the metal key for moving the same, said key having an insulating-tip,substantially as set forth.

13. In a socket for electric lamps, the insulating-body which supports the terminals or connections,formed of non-combustible material, substantially as set forth.

This specification signed and witnessed this 4th day of April, 1884.

SIGMUND BER-GMANN.

Witnesses:

VM. H. Mnanowonorrr, T. GuGnnnNn, Jr.

It is hereby certified that in Letters Patent No. 311,100, granted January 20, 1385,

5 upon the application of Sigmund Bergmann, of New York, New York, for an iinprovement in Sockets for Incandescent Electric Lamps, an error appears requiring the following correction, viz: The grant should read that the said patent was assigned to Bergma'nn and Company, its successors or assigns, instead of Berg'inann 8000., their heirs or assigns, and that the grant should be read with this correction therein to make it conform to the records pertaining to.the case in the Patent Offiee.

Signed, eonntersigned, and sealed this 27th day of January, A. D. 1885.

[SEAL] M. L. J OSLYN I Acting Secretary of the Interior.

Oountersigned BENJ. BUTTERWORTH,

Commissioner of Patents.

Correction in Letters Patent No. 1311,1003? 

